When a pug's tail uncurls it means they are unhappy. My pug uncurls her tail when she is scared, or not feeling well or extremely tired. Just like when other dogs put their tail between their legs to show they are scared.
Our pug often straightens his tail - when he is asleep or relaxed, eating, or just 'moping around'. As soon as he becomes alert, wakes up, etc his tail instantly springs back up. As long as the tail returns to a curl when the pug becomes alert then it is just normal conduct.
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Well, I guess it just depends on genetic history! I have seen both curly tailed and straight tailed pugs. But, it could be a matter of anxiety, so, make sure your pet is still bouncy with its straight tail. If it's still happy then it is probably just genetic history. :)
if the dog is stiffly moving or staying still that means it is cautious (i am 95% sure of that). if it is trembling then it means it is scared.